1 

### B E C K H A M

, L I SA

Fr o m: B E C KH AM

, LISA

S e nt: T hur s d ay

, M ay 28

, 2015 11 : 32 AM

T o: 'St e v e B urr'

C c: J u s tin e M ill e r; M a rin a M e jia

S u b j ec t: R E: A D E Q M in o r NS R in N o n a tt a in me nt A r eas

B y Jun e 15 w o u l d p r o b a b l y b e b e s t

.

Ye s, we a r e d e fi n i t e l y c o n s i d e ri ng t h e c o m m e n t s y o u s ub m i tte d o n R 1 8

- 2

- 33 4 (E) i n m aki ng o u r fi n al d e cisi o n

.

F r o m: S t e v e B u r r [ m ai l t o : B u rr .S te v e n@ a zd e q.g ov ]

S en t: T hu rs d a y

, M a y 28

, 20 15 1 1 : 0 4 A M

T o: BECK H A M

, L IS A

C c: Ju s t i n e M ill e r ; M ari n a Me ji a

Sub j e c t: RE : A D EQ M i n o r N S R i n N o n a t t ai n m e n t A r e a s

T h a t ’s v e r y h e l p f u l, t h a n ks

. I t h i n k I g e t t h e g is t o f i t

, b u t I ’ll call y o u i f I h a v e a n y qu e s t i o n s

. I ’ m g o i ng t o go b ack a nd l o o k

a t o u r calc u la t i o n s f o r S O 2

, b e ca u s e t h a t 2 2 % w as c l e a rl y i n c o rr e c t

. I ’ m s u r p ris e d t h a t d i dn ’ t o cc u r t o a n y o f u s a t t h e

t i m e

.

W h a t s u b m issi o n d a te s h o u l d we b e s h o o t i ng f o r i n l i gh t o f y o u r Jun e 3 0 d e a d li n e ?

O n a si d e n o t e

, ca n y o u te l l m e if E P A is r e c o n si d e ri ng

, b as e d o n o u r c om m e n t s, t h e p r o p o s e d l i m i te d d isa pp r ov a l o f

R 18

- 2

- 3 3 4 (E), w h ic h r e qu i r e s t h e D i r e c t o r t o r e qu e s t a n A Q IA f o r a s o u rc e c o m p l y i ng w i t h R A C T if t h e s p e cif i e d

c o nd i t i o n s ar e m et ? I f n o t

, w as t h is s o m e t h i ng t h e R e g i o n d isc u ss e d w i t h H Q ?

F r o m: B E C K H A M, L I S A [ m a il t o : B E C K H A M

. L I S A @ E PA

. G OV ]

S e n t: T hu rsd a y , M a y 2 8

, 2 01 5 1 0: 3 3 A M

T o: S te v e B u r r

S u b j e c t: A D E Q Mi n or N S R i n N o n atta i n me n t A r ea s

H i S te v e

,

A s d isc u ss e d

, a tt ac h e d is a p r ett y b asic, r o ugh o u t li n e o f t h e ki nd o f a dd i t i o n al cl a rifica t i o n s y o u r c o u l d p r o v i d e r e la t e d

t o A D EQ ’ s m i n o r N S R p r o g r a m und e r 4 0 C F R 51

. 1 6 0 ( e)

. T h is is o n e p o te n t ial s t a r t i ng p o i n t

, t h e r e a r e c e r t ai n l y o t h e rs

t h a t m a y w o rk

.

I ’ m a v aila b l e t h is af t e r n o o n t o d i s c u ss i n m o r e d e t ail if y o u w o u l d l i k e

.

L isa B e ck h a m

E n v ir o n m e n t al E ng i n ee r

A ir P e r m i t s Offi c e

E P A R e g i o n 9

( 4 1 5 ) 9 7 2

- 3 8 1 1SAMPLE/DRAFT

**Additional Clarifications**

**– Basis for**  **Minor NSR Permitting Exemption**  **Thresholds**

**Summary**

As discussed in detail below, ADEQ’s Minor NSR permitting exemption thresholds represent the types

and sizes of facilities, buildings, structures, and installations that will be subject to review for ADEQ’s

minor NSR program under 40 CFR 51.160(e) to ensur e attainment and maintenance of the NAAQS

. ADEQ’s permitting exemption thresholds ensure that only those emissions that are inconsequential to

attainment and maintenance of the NAAQS are exempt from its program . ADEQ’s determination is

based on (1) a stati stical analysis demonstrating the percentage of stationary source emissions ADEQ

anticipates will be covered by its program, and (2) a review of the air quality issues under ADEQ’s

jurisdiction and the expected contribution from minor sources and minor mod ifications

.

**Statistical Analysis**



### [General reference to discussion in SIP submittal (maybe a short summary), include table of

Scenario s 1 and 2, table of final thresholds]

However, as further discussed in the section below, f or purposes of New Source Review

, Scenario 2 does not offer any substa ntial benefits over Scenario 1.

PM2.5 Threshold

[insert discussion ]

**Air Quality Conditions**  **in Areas under**  **ADEQ’s Jurisdiction**

ADEQ currently has permitting jurisdiction over some areas of Arizona that are attaining the

NAAQS and some areas that are not. In attainment areas, where the area is currently meeting

the standard and ADEQ will be implementing an expanded minor NSR program, it is reasonable

to conclude that those sources that remain exempt from the program are inconsequential to

attainment and maintenance of the NAAQS. Below, we discuss the appropriateness of the

permitting exemption thresholds in Scenario 2 in ADEQ’s nonattainment areas.

SO 2 

### Nonattainment Areas

ADEQ has two areas that are currently designated as nonattainment for the SO 2 

### NAAQS

–

Hayden and Miami

. Each of these areas contain a copper smelter with SO 2 

### emissions of

approximately 10,000 tpy , or more . As such, emission increases less than 20 tpy (ADEQ’s

permitting exemption threshold for SO 2 

### ) represent less than 0.2% of the emissions from one of

these smelters

. When compared to these large industrial sources

, it is clear that the SO 2



### emissions exempted from ADEQ’s NSR program will be inconsequent ial to attainment and

maintenance of the SO 2 

### NAAQS. In addition, while ADEQ’s statistical analysis showed that only

approximately 22% of SO 2 

### emissions would be covered by its permitting program, this value

greatly underestimates the SO 2 

### emissions that are actually captured by ADEQ’s program in its

SO 2 

### nonattainment areas . Since the analysis was based on data from Maricopa County, which

does not have the same kinds of large industrial SO 2 

### sources as in ADEQ’s SO 2 

### nonattainment

areas , the actual emissions exempted by ADEQ’s program will be significantly smaller

.

PM 10 

### Nonattainment AreasSAMPLE/DRAFT



### ADEQ has several PM 10 

### nonattainment areas under its minor source permitting jurisdiction

– Ajo, Hayden, Miami, Nogales, Paul Spur/Douglas, and Yuma. [Reference to the fact ADEQ may

have major source jurisdiction, but not minor source]

Ajo

– [see, e.g. http://www.epa.gov/region9/air/az/ajo/index.html ]